lecture18

lecture18 - Common Unbalanced Network Faults...

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© March 2004 Power Systems I 1 Common Unbalanced Network Faults Single-line-to-ground faults Double-line-to-ground faults Line-to-line faults
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© March 2004 Power Systems I 2 Single Line to Ground Fault V a V b V c I a I b I c 0 0 0 1 1 1 1 1 3 1 0 0 2 1 0 3 1 2 1 0 2 2 2 1 0 = + + = = = = = = = = = a a a a a a a a a a a a c b a f a V V V V I I I I I a a a a I I I I I I I V
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© March 2004 Power Systems I 3 Single Line to Ground Fault () 0 2 1 0 2 1 0 0 0 2 1 0 2 2 1 1 0 0 012 012 3 0 a f a a a a a a a a a a a a a a a a a a a a a a a a a I I I I I Z Z Z E I I Z Z Z E I Z I Z I Z E I Z A E I Z E V = = = + + = + + = + + = = = = Positive Sequence Negative Sequence Zero Sequence fault location in network Network Diagram I a 0
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© March 2004 Power Systems I 4 Double Line to Ground Fault V a V b V c I a I b I c 2 1 0 2 2 2 1 0 2 1 0 0 0 1 1 1 1 1 3 1 0 0 0 a a a a a a a c b f a a a a c b V V V V a a a a V V V I I I I I I I V V = = = + = = + + = = =
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© March 2004 Power Systems I 5 Double Line to Ground Fault () 2 2 2 0 0 0 2 0 2 0 1 1 0 2 1 0 2 0 1 2 0 1 1 0 2 0 2 1 2 1 0 1 1 , 1 Z V I Z V I Z Z Z Z Z V I Z Z Z Z Z Z Z Z V I Z Z Z Z V Z Z Z Z I a a a a a a a a a a = = + + = + + + = + = + + = Positive Sequence Negative Sequence Zero Sequence fault location in network Network Diagram I a 1 I a 2 I a 0
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© March 2004 Power Systems I 6 Double Line to Ground Fault () 2 1 0 2 2 1 2 0 2 1 2 1 2 0 2 2 1 0 2 1 2 0 2 1 0 2 1 2 2 0 a a a f a a a a a a a a a a a a a a c b f 012 abc a a a I I I I a a I I a a I I I a I I a I I a I a I I a I a I I I I I I I + = = + + + + = + + + + = + + + + + = + = = = + + I A I
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© March 2004 Power Systems I 7 Line-to-Line Fault V
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lecture18 - Common Unbalanced Network Faults...

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